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Date: Wed, 24 Oct 2012 20:43:51 -0700
From: Joe Perches <joe@...ches.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Kay Sievers <kay@...y.org>, linux-kernel@...r.kernel.org
Subject: [PATCH V2 16/23] printk: Add printk_log.c
Move print_log variables and functions into a separate file.
Signed-off-by: Joe Perches <joe@...ches.com>
---
kernel/printk/Makefile | 1 +
kernel/printk/printk.c | 128 -------------------------------------
kernel/printk/printk_log.c | 149 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 150 insertions(+), 128 deletions(-)
create mode 100644 kernel/printk/printk_log.c
diff --git a/kernel/printk/Makefile b/kernel/printk/Makefile
index 85405bd..a692b68 100644
--- a/kernel/printk/Makefile
+++ b/kernel/printk/Makefile
@@ -1,2 +1,3 @@
obj-y = printk.o
+obj-y += printk_log.o
obj-$(CONFIG_A11Y_BRAILLE_CONSOLE) += braille.o
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 3b18ade..3b5c10e 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -121,12 +121,6 @@ EXPORT_SYMBOL(console_set_on_cmdline);
/* Flag: console code may call schedule() */
static int console_may_schedule;
-/*
- * The printk_logbuf_lock protects kmsg buffer, indices, counters. It is also
- * used in interesting ways to provide interlocking in console_unlock();
- */
-DEFINE_RAW_SPINLOCK(printk_logbuf_lock);
-
#ifdef CONFIG_PRINTK
/* the next printk record to read by syslog(READ) or /proc/kmsg */
static u64 syslog_seq;
@@ -134,139 +128,17 @@ static u32 syslog_idx;
static enum printk_log_flags syslog_prev;
static size_t syslog_partial;
-/* index and sequence number of the first record stored in the buffer */
-u64 printk_log_first_seq;
-u32 printk_log_first_idx;
-
-/* index and sequence number of the next record to store in the buffer */
-u64 printk_log_next_seq;
-u32 printk_log_next_idx;
-
/* the next printk record to write to the console */
static u64 console_seq;
static u32 console_idx;
static enum printk_log_flags console_prev;
-/* the next printk record to read after the last 'clear' command */
-u64 printk_log_clear_seq;
-u32 printk_log_clear_idx;
-
#define PREFIX_MAX 32
#define LOG_LINE_MAX 1024 - PREFIX_MAX
-/* record buffer */
-char __printk_log_buf[__PRINTK_LOG_BUF_LEN] __aligned(PRINTK_LOG_ALIGN);
-char *printk_log_buf = __printk_log_buf;
-u32 printk_log_buf_len = __PRINTK_LOG_BUF_LEN;
-
/* cpu currently holding printk_logbuf_lock */
static volatile unsigned int logbuf_cpu = UINT_MAX;
-/* human readable text of the record */
-char *printk_log_text(const struct printk_log *msg)
-{
- return (char *)msg + sizeof(struct printk_log);
-}
-
-/* optional key/value pair dictionary attached to the record */
-char *printk_log_dict(const struct printk_log *msg)
-{
- return (char *)msg + sizeof(struct printk_log) + msg->text_len;
-}
-
-/* get record by index; idx must point to valid msg */
-struct printk_log *printk_log_from_idx(u32 idx)
-{
- struct printk_log *msg = (struct printk_log *)(printk_log_buf + idx);
-
- /*
- * A length == 0 record is the end of buffer marker. Wrap around and
- * read the message at the start of the buffer.
- */
- if (!msg->len)
- return (struct printk_log *)printk_log_buf;
- return msg;
-}
-
-/* get next record; idx must point to valid msg */
-u32 printk_log_next(u32 idx)
-{
- struct printk_log *msg = (struct printk_log *)(printk_log_buf + idx);
-
- /* length == 0 indicates the end of the buffer; wrap */
- /*
- * A length == 0 record is the end of buffer marker. Wrap around and
- * read the message at the start of the buffer as *this* one, and
- * return the one after that.
- */
- if (!msg->len) {
- msg = (struct printk_log *)printk_log_buf;
- return msg->len;
- }
- return idx + msg->len;
-}
-
-/* insert record into the buffer, discard old ones, update heads */
-void printk_log_store(int facility, int level,
- enum printk_log_flags flags, u64 ts_nsec,
- const char *dict, u16 dict_len,
- const char *text, u16 text_len)
-{
- struct printk_log *msg;
- u32 size, pad_len;
-
- /* number of '\0' padding bytes to next message */
- size = sizeof(struct printk_log) + text_len + dict_len;
- pad_len = (-size) & (PRINTK_LOG_ALIGN - 1);
- size += pad_len;
-
- while (printk_log_first_seq < printk_log_next_seq) {
- u32 free;
-
- if (printk_log_next_idx > printk_log_first_idx)
- free = max(printk_log_buf_len - printk_log_next_idx, printk_log_first_idx);
- else
- free = printk_log_first_idx - printk_log_next_idx;
-
- if (free > size + sizeof(struct printk_log))
- break;
-
- /* drop old messages until we have enough contiuous space */
- printk_log_first_idx = printk_log_next(printk_log_first_idx);
- printk_log_first_seq++;
- }
-
- if (printk_log_next_idx + size + sizeof(struct printk_log) >= printk_log_buf_len) {
- /*
- * This message + an additional empty header does not fit
- * at the end of the buffer. Add an empty header with len == 0
- * to signify a wrap around.
- */
- memset(printk_log_buf + printk_log_next_idx, 0, sizeof(struct printk_log));
- printk_log_next_idx = 0;
- }
-
- /* fill message */
- msg = (struct printk_log *)(printk_log_buf + printk_log_next_idx);
- memcpy(printk_log_text(msg), text, text_len);
- msg->text_len = text_len;
- memcpy(printk_log_dict(msg), dict, dict_len);
- msg->dict_len = dict_len;
- msg->facility = facility;
- msg->level = level & 7;
- msg->flags = flags & 0x1f;
- if (ts_nsec > 0)
- msg->ts_nsec = ts_nsec;
- else
- msg->ts_nsec = local_clock();
- memset(printk_log_dict(msg) + dict_len, 0, pad_len);
- msg->len = sizeof(struct printk_log) + text_len + dict_len + pad_len;
-
- /* insert message */
- printk_log_next_idx += msg->len;
- printk_log_next_seq++;
-}
-
/* /dev/kmsg - userspace message inject/listen interface */
struct devkmsg_user {
u64 seq;
diff --git a/kernel/printk/printk_log.c b/kernel/printk/printk_log.c
new file mode 100644
index 0000000..b5c2b8f
--- /dev/null
+++ b/kernel/printk/printk_log.c
@@ -0,0 +1,149 @@
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/kexec.h>
+
+#include "printk_log.h"
+
+/*
+ * The printk_logbuf_lock protects kmsg buffer, indices, counters. It is also
+ * used in interesting ways to provide interlocking in console_unlock();
+ */
+DEFINE_RAW_SPINLOCK(printk_logbuf_lock);
+
+#ifdef CONFIG_PRINTK
+
+/* index and sequence number of the first record stored in the buffer */
+u64 printk_log_first_seq;
+u32 printk_log_first_idx;
+
+/* index and sequence number of the next record to store in the buffer */
+u64 printk_log_next_seq;
+u32 printk_log_next_idx;
+
+/* the next printk record to read after the last 'clear' command */
+u64 printk_log_clear_seq;
+u32 printk_log_clear_idx;
+
+/* record buffer */
+char __printk_log_buf[__PRINTK_LOG_BUF_LEN] __aligned(PRINTK_LOG_ALIGN);
+char *printk_log_buf = __printk_log_buf;
+u32 printk_log_buf_len = __PRINTK_LOG_BUF_LEN;
+
+/* human readable text of the record */
+char *printk_log_text(const struct printk_log *msg)
+{
+ return (char *)msg + sizeof(struct printk_log);
+}
+
+/* optional key/value pair dictionary attached to the record */
+char *printk_log_dict(const struct printk_log *msg)
+{
+ return (char *)msg + sizeof(struct printk_log) + msg->text_len;
+}
+
+/* get record by index; idx must point to valid msg */
+struct printk_log *printk_log_from_idx(u32 idx)
+{
+ struct printk_log *msg = (struct printk_log *)(printk_log_buf + idx);
+
+ /*
+ * A length == 0 record is the end of buffer marker. Wrap around and
+ * read the message at the start of the buffer.
+ */
+ if (!msg->len)
+ return (struct printk_log *)printk_log_buf;
+ return msg;
+}
+
+/* get next record; idx must point to valid msg */
+u32 printk_log_next(u32 idx)
+{
+ struct printk_log *msg = (struct printk_log *)(printk_log_buf + idx);
+
+ /* length == 0 indicates the end of the buffer; wrap */
+ /*
+ * A length == 0 record is the end of buffer marker. Wrap around and
+ * read the message at the start of the buffer as *this* one, and
+ * return the one after that.
+ */
+ if (!msg->len) {
+ msg = (struct printk_log *)printk_log_buf;
+ return msg->len;
+ }
+ return idx + msg->len;
+}
+
+/* insert record into the buffer, discard old ones, update heads */
+void printk_log_store(int facility, int level,
+ enum printk_log_flags flags, u64 ts_nsec,
+ const char *dict, u16 dict_len,
+ const char *text, u16 text_len)
+{
+ struct printk_log *msg;
+ u32 size, pad_len;
+
+ /* number of '\0' padding bytes to next message */
+ size = sizeof(struct printk_log) + text_len + dict_len;
+ pad_len = (-size) & (PRINTK_LOG_ALIGN - 1);
+ size += pad_len;
+
+ while (printk_log_first_seq < printk_log_next_seq) {
+ u32 free;
+
+ if (printk_log_next_idx > printk_log_first_idx)
+ free = max(printk_log_buf_len - printk_log_next_idx, printk_log_first_idx);
+ else
+ free = printk_log_first_idx - printk_log_next_idx;
+
+ if (free > size + sizeof(struct printk_log))
+ break;
+
+ /* drop old messages until we have enough contiuous space */
+ printk_log_first_idx = printk_log_next(printk_log_first_idx);
+ printk_log_first_seq++;
+ }
+
+ if (printk_log_next_idx + size + sizeof(struct printk_log) >= printk_log_buf_len) {
+ /*
+ * This message + an additional empty header does not fit
+ * at the end of the buffer. Add an empty header with len == 0
+ * to signify a wrap around.
+ */
+ memset(printk_log_buf + printk_log_next_idx, 0, sizeof(struct printk_log));
+ printk_log_next_idx = 0;
+ }
+
+ /* fill message */
+ msg = (struct printk_log *)(printk_log_buf + printk_log_next_idx);
+ memcpy(printk_log_text(msg), text, text_len);
+ msg->text_len = text_len;
+ memcpy(printk_log_dict(msg), dict, dict_len);
+ msg->dict_len = dict_len;
+ msg->facility = facility;
+ msg->level = level & 7;
+ msg->flags = flags & 0x1f;
+ if (ts_nsec > 0)
+ msg->ts_nsec = ts_nsec;
+ else
+ msg->ts_nsec = local_clock();
+ memset(printk_log_dict(msg) + dict_len, 0, pad_len);
+ msg->len = sizeof(struct printk_log) + text_len + dict_len + pad_len;
+
+ /* insert message */
+ printk_log_next_idx += msg->len;
+ printk_log_next_seq++;
+}
+
+#else /* CONFIG_PRINTK */
+
+#define LOG_LINE_MAX 0
+#define PREFIX_MAX 0
+#define LOG_LINE_MAX 0
+u64 printk_log_first_seq;
+u32 printk_log_first_idx;
+u64 printk_log_next_seq;
+struct printk_log *printk_log_from_idx(u32 idx) { return NULL; }
+u32 printk_log_next(u32 idx) { return 0; }
+
+#endif /* CONFIG_PRINTK */
--
1.7.8.112.g3fd21
--
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